israeli prime minister benjamin netanyahu has told the united nations that the world has until next summer to stop iran from building a nuclear weapon. the white house reacted by saying the u.s. shares israel's goal of stopping that from happening but so far it has refused to set an ultimatum. nbc's danielle leigh reports. >> reporter: from a fight over the west bank to fears about iran's nuclear program, israeli's prime minister benjamin netanyahu spoke under pressure before the united nations. >> today a great battle is being waged. >> reporter: just one day after iran's president mahmoud amadinejad spoke, he netanyahu delivered an ultimatum. >> a red line should be drawn right here before, before iran completes the second stage of nuclear enrichment necessary to make a bomb. >> reporter: israel and the west suspect iran is trying build a nuclear weapon and fear the impact on the region, but so far diplomatic efforts to stop iran who calls the program peaceful have been unsuccessful. netanyahu spoke directly to the palestine yal president mahmoud aback. >> we won't solve our problems wit